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11. Mary Callahan Erdoes

Chief executive

The division of J.P. Morgan Chase & Co. run by Ms. Erdoes, 43, is a giant in its own right. With $1.3 trillion in client assets, it ranks as the ninth-largest money manager on Earth. In addition to supervising 17,000 fund managers, private bankers and other staffers worldwide, Ms. Erdoes oversees Highbridge Capital Management, one of the world’s largest hedge funds.

A 15-year veteran of J.P. Morgan, the executive is focused on generating more overseas business, particularly advisory services for the ultrawealthy. She’s off to a promising start. In 2010—her first full year at the helm—revenues for her unit increased 13%, to $9 billion, and net income grew 20%. That may be why Ms. Erdoes is one of a handful of candidates seen as possible successors to Chairman and CEO Jamie Dimon.